212204121 has 4 divisors (see below), whose sum is σ = 282938832. Its totient is φ = 141469412.

The previous prime is 212204101. The next prime is 212204137. The reversal of 212204121 is 121402212.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 212204121 - 2¹⁰ = 212203097 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 212204121.

It is not an unprimeable number, because it can be changed into a prime (212204101) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35367351 + ... + 35367356.

It is an arithmetic number, because the mean of its divisors is an integer number (70734708).

Almost surely, 2^212204121 is an apocalyptic number.

It is an amenable number.

212204121 is a deficient number, since it is larger than the sum of its proper divisors (70734711).

212204121 is an equidigital number, since it uses as much as digits as its factorization.

212204121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70734710.

The product of its (nonzero) digits is 64, while the sum is 15.

The square root of 212204121 is about 14567.2276360329. The cubic root of 212204121 is about 596.4645052697.

Adding to 212204121 its reverse (121402212), we get a palindrome (333606333).

The spelling of 212204121 in words is "two hundred twelve million, two hundred four thousand, one hundred twenty-one".